A 50-day-old baby’s tongue may be a normal phenomenon, or it may be caused by strong secretion of salivary glands, oral diseases and other reasons. 1. Normal phenomenon: 50-day-old babies’ nervous system is still immature, and they are in the exploratory period, they are very curious about many things around them, so they may spit out their tongues to sense things around them through their tongues, which is a normal phenomenon without special intervention. 2. Exuberant secretion of salivary glands: the salivary glands of 50-day-old infants are exuberant, secreting more saliva, and the development of the infant’s swallowing function is still immature during this period, resulting in too much saliva can not be swallowed in a timely manner, resulting in the spillage of saliva, which may cause the infant to appear to spit out his tongue as a way to lick saliva. 3. Oral disease: commonly found in thrush, oral ulcers, these oral diseases, resulting in pain and discomfort in the mouth of the child, which may be the phenomenon of the tongue, want to spit out the tongue to alleviate the symptoms of oral discomfort. 50 days of infants spitting out their tongues, may also be caused by other reasons, should seek medical attention as soon as possible, after the cause is clear, by the doctor to guide the treatment and conditioning.